SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92647458791d13bee4b1e2d728fe24575ee7383d32cc8f6fb0aa0ab7db466d31' 
  AND token = 'NjDGLd+HXjRujIzFo6gWVWfHqInCh/geqoUzHDMkAqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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