SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f1f9a87a33431b473bc58b4da005327ab1ab2299cd33a4de24caa3f38613e49' 
  AND token = 'vJ/TKvPlHX5hBXlBpf6asX+gw1Ctd1gWZA5cGEMqejw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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