SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fbd8fffb1c5bf49128553b001e0d4beaa605b3334bc541031a0af04be7b280b' 
  AND token = 'im9tAqhf0M2Y+M3/jToZqLct9X83lJ/swHXJVJEGRKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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