SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f406c397ba92987d335214a38f3e843f4ea1fcf35c5ee349a444e12f946334e1' 
  AND token = 'Yj+KG5824zIoKJWCUXHTBXZJFlOnsvXFultNxmVNpCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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