Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '847b1e043429a363cb8219267e3e36ff1092f56e325d60ae2358247da6342dc4' 
  AND token = 'aj73AAWg86WdplJrVgJ+1HEhsAPW/cv4pyp9yWXmykU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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