SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69581d09c3654255ebbca22c0cd65d1e05cb17f8c2751d430f7ad89aedffff2a' 
  AND token = 'o9RHchYwoHp/sqmPr95ThgmohsozJpNrZhFTbwyw/2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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