SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aba88cd893c4befe60833acf3177b73bd0f5b6eaf14463f3156f17342cc91619' 
  AND token = 'kgDyVfBqZQB/nj+anrxHxNvKVzMDs7uwgWgBA65yXVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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