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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '139a5394900d61ed24b5bf952fd38ad43a6ae72179073f1f03e74ec1785a5f46' 
  AND token = 'buqk1/9+0VAVfkXmrJcPl9NOc+u6f/96xU0zot6nivU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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