In terms of fit that is determined by the socket type which says it supports FM2/FM2+. If you check the manufacturer's support pages here:
EMX-A70FM2+iCafe Motherboards
www.emaxxtech.com
There is a PDF there that gives you a list of the CPUs you could use. Since you don't know anything about how comparing CPUs let's' look up the one you have now:
That CPU you have scores 1435 marks which is still passable for a light browsing the Internet, but I agree, it's not very fast. If you are running an older HDD than it would be terrible slow. I think a SSD instead of a HDD would help the most here but let's compare your current CPU to a modern bottom-of-the-line AMD CPU:
See? Over 7000 marks and all you need is that CPU a basic B450 chipset motherboard from anyone (Asus, Gigabyte etc..) and a 8GB RAM kit off the QVL and you are in much better shape then looking for a good used FM2 CPU.
If you go for the used FM2 CPU you will be somewhat constrained by availability of what is being offered through the used market. You can use that website I showed you to figure out how fast the CPU is going to be before you purchase it. Also....you might have to upgrade the cooler too, so there might be an additional expense. I use this one:
Cooler Master Hyper 212 Evo CPU Cooler, 4 CDC Heatpipes, 120mm PWM Fan, Aluminum Fins for AMD Ryzen/Intel LG1151 : Amazon.ca: Electronics
www.amazon.ca
It works for the FM2/FM2+ Socket and it's easy to install.