SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd360cb4b39dae912d5ab49c19e8f3ec2761165bad3b24f8149d2ce0f6ff78d53' 
  AND token = 'MV2T3svjSwZB+IOa1IHSyfVKCceAY5YZJ7CERtJe49s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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