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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60915d1850d5c9363e4a165439a1cfa62511380dbfb0680f4c409ef28a84d92f' 
  AND token = 'q+CEZCfer99ey+hA7DjoQfRbETbK9yHGtht7eJqhKWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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