SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c236db3d74da8241f601b21755c1f535e7e51248b8a74f5e023bd31eb766190b' 
  AND token = '0XDKn/WgV1BDvI81H9f259RCzqSWR/jXgsazLKvZGyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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