By tiny gap, do you mean that the keys are located on fractions of frames? Like a key sits on 3.723 time? If so, in the timeline settings there's an option to turn on discrete frames (can't remember what it's exactly called) so that keys can only sit on integer times; then you shouldn't have keys separated by tiny gaps and it's easier to see where the keys are. Also, try opening the graph editor and see if that helps you.