When you run keynote (or any program) everything that you do is stored on the RAM until you click 'save', at which point it is transferred to the hard drive for permanent storage.
When a program crashes, and you force quit (or it quits), everything related to that program on the RAM disappears forever. So only the things that you saved onto the hard drive can ever be recovered.
There simply is no way to recover the data as it doesn't exist anymore.
