Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90581bb14ae0c4ac0c43a01ec6e07b7d37df61e9d62f1ade75b1019ee514f70f' 
  AND token = 'CZbPm9k5Tq5rXASK0vk+Y82tIK3YFPmfkeXb86Bq3JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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