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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfe43b2d48729e6aac623e5e83170e9cdb60336f89e8e97c11498d027e02a35f' 
  AND token = '7KUsu/sI7sE0ILfIGgS89ocjHgLlCfGwLITH/yx6vnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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