Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b56a45effb04b30b9808a8467401678584d7ffd69591b46e448a931719585da3' 
  AND token = '4xU0iTW12pVOdyYQ2J7EOTBcwBHnKSwkpC33SEs2PFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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