SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cc70284587845665faa0939d2aa7037bed3bdbfc46e5c1453a4d2a2aa213003' 
  AND token = 'bz81TZ1Ayu/gQ8S4df5f+wvPN6JRMEZx4eBGZV9YOnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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