SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ed2f62d5944d8b2bd2f3a89e45a492dff8d63d65b7ef8faccff234c107b8966' 
  AND token = '8Lxe9yhK0ZQiH2N18zQN//PkAUWFlXvCKDFLhmVX+N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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