Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50fe235c7f6e0df3ea71f35d27c8aff2d8b2e56b853e036eeb38aaff7ff7d4a1' 
  AND token = '901OmSZh5ICrjUfEdqBx4lYG+4XTWA5tYxkee77mIGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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