SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24745b8d1b643c0a70c10d76a9ca839753551da2fffec6c5c87a49170027b5cf' 
  AND token = 'GaKMPTCHSg/AXpF9wWP2ZniY61pfwV5KOR6ve3jhcTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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