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Another option:
sed -n 's/key[12]: //p' file | paste -d" " - -


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( or sed -n 's/key[12]: \(...\)/\1/p' file | paste -d" " - - if you will )


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That will not work since even in GNU...

This at least works in GNU sed


mute@tiny:~$ sed -n '/key1:/{s/key1: //;h};/^key2:/{H;x;s/\nkey2://p}' input
ABC DEF
GGG HHH


Place it in hold space. Append key2 to hold space, swap...