Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbe29abfc889ec5573814b0a589bf09fd6e5bbd8ee83e47bf2235d169ea55204' 
  AND token = 'jh0XI/K8doyzMfXW27cjn6XyQPZk5+U6Ib/Dy7IsD3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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