SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '439d12c39899069218ed510df489631cdb581a25166f6448f39bfecfc0fe7d61' 
  AND token = 'kJ25LBXhy8HZLuNacvzecGTLvlAdGXVVZufzl8Qv5mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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