SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85995e56a2dbb5e73ed7bb3bd3fb45bcf3cc6978a3405222174806303825ed19' 
  AND token = '6LHtG+cOdoTVVV/RIu2AxBj0VPXt2PSoJ5NHV/nqEMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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