SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '800c9a305b4fbdc221c844c6392bd28e15f36817dbace53de735a38fa26469cc' 
  AND token = 'FqLUIQk4UjTCzkjXyDQ26Wpp+xHO+PKVei1tplZivPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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