SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0371389d745515c444122bfc7899c3828eae9dbe979885a7befbc74539bc4f95' 
  AND token = 'x5NLrV54kvEh2h7eG5q7uy4eOTq/YL6TwXKkzgW2UvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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