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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '198ae203d0bb925baaf21bfa6a77cf5a303ebbfdc101c9a51f2a99bda5dda959' 
  AND token = 'uHUr6Y70S8xukeDLjjaOWwRA5vpfyFRv0P1bDUDlAqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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