Sorry, what are you trying to do?
Move a key from frame 5 to frame 10?
Move several keys from frame 5 to 10?
Or move the time cursor from frame 5 to 10?
You should not hold CTRL when trying to move keys because that's the shortcut for adding a selection.
SHIFT is for disabling frame snapping.
You probably not hold any keyboard key if you are just moving dopesheet keys.