SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e2b5435bce24e057f6cd6dc1269e1daa5770865822ef05446bcbf2914922d63' 
  AND token = 'OYQWMR8pelip1Y8jp3sY/A9KsByZ0KsvHq1hH1Cm7oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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