SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a29f82422d94623fcde53925a7b208b8a33c70a7fd64c29d2241e5a9dc66183' 
  AND token = '6LiPfamGc+gOPO3EznqhORxKlaoTyC5VvWwxTmru7wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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