SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd74beeeeee91367b1874d6ab68d73f44d7f82925ab31dc0cfb82c56867a5473f' 
  AND token = 'q0BITHI+MbL9xOy4HPezO0drzXO3Ee/JmvhgrUDgNw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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