SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fad7b54f4124d6e1dae7d0674cf215e652843a7ec1193501ba7aa8d00de246b' 
  AND token = 'cqz8DC6ZS5iBzjlwKKR/REqp9eI4JGOjV7VBzjfzf/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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