SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '108a27cbf2494f518f2850b4e55576b7d2b778f9a62d187ca5213a78432bc348' 
  AND token = 'qdGj+91CbrodTulkMFuGjHLZ9RoZsM8rvuOVk3XsSB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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