You could just make mortises in the top and tenons in the base and let the top sit on the base. Could even use Dominos as one simple option.
Alternatively, you could use angle iron, perhaps 1 1/2" size around the base where it meets the top that would conceal it from side visibility. Screws go into the top and the top side of the base. That would allow the table to easily be moved without coming apart from the base.
Welcome to FOG - please share photos as you proceed with the project!