SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1f403028bd02bda290e05d53a3d6497f7d47633c933ed8dce1d0ee5697551cf' 
  AND token = 'MFUYVITkC3vfeVw0IDtzIsgr6Xgc/hBYkHQXVy3uq3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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