SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90f97eb6edab33d409c16656cc09bde06ec23e75c51067f75c193612304f1356' 
  AND token = 'Yjpugh/+wHsCuDog2t3yJIlZ2O5T3/KTXOlJA5cGa2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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