SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fe2b82a569a30be3d8ac7b23448e150d339b02547ca28e4c4d7ca087f901dad' 
  AND token = 'YyC/OkKwulyCeyxZ0BcW9ZV3UQEzo2KqT1+ZtHK0mm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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