Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3e821ddd402251aa47abd82d2b67ffd3afddb7f947e9bf2dd83ca0ea60407b7' 
  AND token = 'EusUQbeX4TKHoFJT0n+1TfwlgNalGY2h9eYaFhtCs1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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