SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'affc90828fde2d13be3a8b4e050704d02a1ea6e033c54deb423751bf93618ad5' 
  AND token = 'SwKPf8ZTdnKg7jcqaZu7Zn8amPuZtCCYm+Pc6T/Jxb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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