glSelectKeys

1. this script select keys from selected channels in channelBox
at current time or selected timeRange
2. second option is to delete keys, to do this set in command delKey=1
select keys --------------> delKey=0 (default)
delete keys --------------> delKey=1

put file glSelectKeys.py to maya scripts folder
run script command from file
glSelectKeys_runCommand.py
run in python tab, assign it on hotKey or shelf 

add=1 ------- mean add keys to current selection
tgl=1   ------ mean toggle keys selection
filter=1 ---- mean curves isolate in graphEditor
delKey=0  ---- mean select keys mode (default)
delKey=1  ---- mean delete keys mode