SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb0631430734b807db443f642391ffee9d531bab5599de45f0c368389c0fe473' 
  AND token = 'CtPBmZUwC1h5dYxGGexouqzdY1Th1hFWjxh7FlFpBnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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