Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0042338f5f7adc8343ce6fe541e090ddc1bf2e440194da397cd43a252de2f8c8' 
  AND token = 'njPfCP+/+2TDeOpYz2xc/yAfcwZjzBatuzZrdwyO4Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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