SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd2765392c5898d7f5d9b6c9bc4ccf178bb6aa7c849a10fad46bf5fddc95a539' 
  AND token = '9oJM+wVHubQketyCfexLKBdPzXohHGQXgZ8rGp3w8sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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