SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58f4621c49b7bee7bb375b3afed63ec4544530c69c7d5b20db05bf008b652167' 
  AND token = 'R0a5X9nST+bUuJZBYD7uagRshqKHtJ8LYD6xSNJHv18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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