SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5eca7caf1ba9ccccf303a5dd7fa09818d34dd19411591767718e647586902068' 
  AND token = 'IgQ1GDhK25FvNz2N1F8iRmZnX8FgVVbcpnOBgV0m2hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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