SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b77f6cd939bb15e4dad998c883862f54b5132c99c9faa2a7ab5498ac57ce007' 
  AND token = 'qOLoSDMU1WMheAElvgt6TijJan+YKHQmujYOv5UiHvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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