SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4642677f7257903e0c6aa623b2efa8714109e91d825c5ca95031091fb823f2b9' 
  AND token = 'wEE8JM00Q9rykn+YF5RU0MnIdBvLlVsh8ZGsPWl9jSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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