Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a81a5ba37f30be086a7ca2387db138ce3cbd511591bb757d5f382a2f9a4bf39b' 
  AND token = '5i1yzIt/v5KVopwhPXWSTO/JceMy1f3yR1efq9FgMMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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