SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c3564929fce818f2c17095fb4e66a0d180239b40268cc89de87bd1ed4ed6128' 
  AND token = 'RRYLno7YV6oFVhCJNb/zwEQeoeBU6uWH9d38v7i5wsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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