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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '948a03703c9dbe88432bcb5c2e8ba0d7abf33359e518b1282bca43e5153b528c' 
  AND token = 'ZwKKJYUmVGRtOaWDOWsgblR20m1iE9czogMOU5lT+wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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