SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61f989af870acf428d771083718a21e27f91dba7c3fd25c486655ce384afac93' 
  AND token = 'afY7KGC4B6cWk1yVGqldSQmqRkZabXBVSsKoh3LDz1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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