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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67c5155aa203f8420c3b9a053eb49fb453e88416f889181f4c75e127050b3b62' 
  AND token = '3sZFitFJx4dSO62RSNHUdoUDIHZ5GDld9tM/0CNque0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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