SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce3ecdae86de1594b21325512335418417b4b8338d634125d34d92e36d3bd099' 
  AND token = 'HfLUVvohLf+NVcL6FFdXWjAwcGUDpiqPm8/1t/fyys0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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