Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd5f6b83c8e25e636dbeb6e04e62487b42a9a3d502b3e7906e30f7257318e02e' 
  AND token = 'UHh9Ptv3exTnxQmyRSgF0JbDfNUfwb4WherhEiLQE9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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