Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8506b67e8c7f38f5e8d557ebfbade56c3e4b44f32bf96299810ee21a636f0aa' 
  AND token = '3XQVcHcvQ4qWVcFoiuR3fPmd4BV2J1+C9eT0+kuc7tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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