SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31a92f787d217bc72764d9b4997b730fb18089c7bc345f8e46a590fc7d3c97fb' 
  AND token = 'fUC6v4l0+jI03ZEc1K5Ww5rXTemnY/vVm4Ve9gqbH38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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