SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbaa57ddb7808179200e8b309ca3c481bea6b7f85316b43f0f01ffcb14e226d9' 
  AND token = 'Oz+vH7ynccE9uQKLeIYJk/qprzSmb87DUEWv1jv7MBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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