SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62930424e47c09e5549dd4dca3ab398078aee80a7bab7d47f13cf3cf7a443622' 
  AND token = 'aNu/YLyUueGB2tqMlIgSKt+8Yhn/fC6FhEoRwZkuWoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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