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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7aa84573c2975a61d42297df35b6c53a42919192994411680e7d75ce4cc4f2c4' 
  AND token = 'fcntlkVFBpeT5ck6wRgy++KnSUSqEeUCJv/1sfd2un0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}