SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82f0f03235625bcc9d2c17e684d3868f0226148aea2f9a005938388f5ebb03b9' 
  AND token = 'uFmKm+wxWT9lBIM9dCpJY9D0SDVS6DjDJXM1YfZMibU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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