Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ec6e9055390a87b56d4b577f6878e1221d7ba2df325cb1e0308f9d1ab35aa9a' 
  AND token = 'BN9QfSWjeGvldDg0OZUt1rMuwtnj9a3vRuLnlAfGz1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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