SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d75d34868e2d441e5dbbfb745e56ef20c7919106d9ea181d142a33a87e3069f' 
  AND token = 'Qw22H4yXEX4PKzN5fQN73R/dMjJoHYJgDJBPFF9qbNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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