SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cad0a89472d7a184f2ede81ec806f95081b9bd357f445125f7b68c7198f27aa3' 
  AND token = 'HZEyz3bOrcc+DK8kZcRDw0KsHuKl+1OfnUYZKfqjsFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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