A true "AetherSX2 32 bits android" optimized build does not exist in an official capacity. However, compatibility builds do exist that allow 32-bit Android systems to attempt to run the app.
Switch between Vulkan and OpenGL to see which performs better on your chipset. Aethersx2 32 Bits Android
Related search suggestions available.
If your phone has less than 4GB of RAM or a chip released before ~2015, it is almost certainly 32-bit. Notable examples: A true "AetherSX2 32 bits android" optimized build