SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd0388948d58b31eb7e1e74231e682b1d175b48fbf677f9c1f623f54d7496b1e' 
  AND token = 'vpJn41P9hKIiy6w5JhFcMj/sGhhP9IjPB3+dp0I6aIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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