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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afe21e0ef5d2b9d7f7db3c493b117a73522b9bd3684f82af6d79319b70bd1f2d' 
  AND token = 'PLMWt39Va6h2m3xq/QhwV7Y26TT4oJdvULr1mFQDIMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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