Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab072ae37bb6002e657cf4368c84e31f871f4ac29b96e452939c5ff5c25297fa' 
  AND token = 'buy1ZJNRaS4yqcLSNZ/KAhgyxioMuWDRTkuAUdhIzAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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