SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ded3ea59cc05be679f4192faae7de7e8f85d394958642528014b6ea6dc045b9' 
  AND token = '18G/ZSDGPmvIYg35FSeoIwxXLGSBw4Zj2C/JDPagQ/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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