Mouse-free, swipe-free escape plans: Shutting down Windows 8/8.1 is already pretty fast. Make it even faster using Windows key and U.
Shut down your computer the same as if you clicked the on-screen power button with Win+X, U, U. Win+X, U, U
Restart your computer without powering it down with Win+X, U, R. Win+X, U, R
Put your computer into a low power state to preserve battery and screen life utilizing Win+X, U, S. Win+X, U, S