Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fb028e79257c51daffb4959a34a232abfc6ea1884be372c8237ae121b841e6b' 
  AND token = '8s3elYd6IJhdxyfANy86St8PhZvofKkHmnE3DMKCBdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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