SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f97bf1f7cb023c9409528b41f8c55f40aaefb2cc285631adb05befab018acf26' 
  AND token = 'oaG/Hj1I05z1XJSHg6LbRnYNlopJ4Ke/Jqr3nwhXjIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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