Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8929c606bf188a2b60c212e7e90e8e0cd1dd617b6932ecdd825584a3a31c3cd' 
  AND token = 'NBQz1N+6HvVgUbRVrl7QvjsTNB+oYVnucyOObsPo2dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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