SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd9d69dbf3d80671b91fce2afba3b78074230b16f6e48f9290666918ac88c0a3' 
  AND token = 'dqYNnhcEteACR+jr4UF0zFkFD/BCll9DwAmYaCngvEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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