SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd268837555cf728fc93048bdd6ab050fa743cc43480b346d452adb0cbc8bc4d3' 
  AND token = '89JmWnlnZFflvwRRukupq+RrPT1/K6wyQ2l5vk/5A3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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