SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb44a88d663903cc1b457297f5327f3de2199089b81acc2b8bf1fc0a7e48f745' 
  AND token = '+MwFFylnjRae2x6MGhiK+7xInpq95kd8JNyhqZ+DQjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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