SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f9a28b23409d3a82a7a3e7b5958f416059457ecc4c9b63a16fb0cf1e78a6d73' 
  AND token = 'vwkWgwoaofKO2nFNOIzne+QkztpnwvoK8OdlXujiLZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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