Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a81fd57a249886b0ba86f2de2ed28cfe51b0f3caadbfd84afd8bbf5f1893607' 
  AND token = 'k1L6e/7xJ0Lt3vZacr7l1bDCzR61zP5KNeqS33FJGAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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