SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45ab46fde0607aa5d29b850130092ca928e80a638014f073e287e617037ad4cb' 
  AND token = 'TmnFyjeJKGPgHmZIQNL5rq8ztkGRiyglN5TI69jZLAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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