Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e53214ae0ee0782df9bb654f694e7833c2cdee85645a54e4fbac078dbfe4446f' 
  AND token = 'BUAFrQy5nDl2i39uuC/Q4Ns8Ju/mSs7aeCE4OcU66/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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