From Mageia wiki
Release key (835E41F4EDCA7A90)
This key is owned by the user releasekey on rabbit
ssh root@rabbit su - releasekey gpg --homedir keys --edit-key B21076A0CBE4D93D66A9D08D835E41F4EDCA7A90
You should then use expire command and pick a new date, then use save.
Next step is to push it to some servers.
For example:
for ks in keyserver.ubuntu.com pgp.mit.edu keys.openpgp.org pool.sks-keyservers.net keyserver.stack.nl keys.fedoraproject.org pgp.surf.nl pgp.key-server.io keys2.andreas-puls.de certserver.pgp.com; do gpg --homedir ./keys --keyserver $ks --send-key EDCA7A90 done