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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af9b36477bc3c85952b25aa8dbef29c27d7eaa9c5ae9f4e5e3de1a1c0065f1b6' 
  AND token = 'AfNGo9hYzACAeRAS1eJ3WxZzwRzplHcI1x6q07ZrR6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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