SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e0f84e6621c7fee571521b63361ee6dc72aa1d88a40752c11c00c256fff615c' 
  AND token = '9V18m/QS7XNDbK2V3BLbGuVXKACmnb8YajFD9UZz2Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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