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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01d32ceca83d2015a643071755bfe864f43f9d9b9a4c338fe68bfead6dcf5683' 
  AND token = 'lWKxbj/vfXsiIjiUl/1OgWiJbwnne6OJ4s0PqNqfSkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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