SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7acae3e2cc81fda6fedf09d0cc2b8319ee3d5da62ebf964f51edfd82f465a114' 
  AND token = 'nCRFUzflbVf7x37zG+ACqgW01MQB0rKJnZWFhbJ4wwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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